Optimal Design of Hybrid Mode DC-DC Converter for PV Applications

Electrical and Electronics Engineering

This paper presents a multi-mode hybrid-type full-bridge dc/dc converter with high efficiency. Using two different control schemes with a simple circuit structure, the proposed dc/dc converter has hybrid operation modes. Under a normal input range, the proposed converter operates as a phase-shift full-bridge series-resonant converter that provides high efficiency by applying soft switching on all switches and rectifier diodes and reducing conduction losses. When the input is lower than the normal input range, the converter operates as an active-clamp step-up converter that enhances an operation range. Due to the hybrid operation, the proposed converter operates with larger phase-shift value than the conventional converters under the normal input range. Thus, the proposed converter is capable of being designed to give high power conversion efficiency and its operation range is extended. A Solar PV system is fed at the input of dc/dc converter and analyzed for both low power applications and high power applications. The Proposed system is designed in MATLAB software for analysis.

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